Restrict access to clipboard (copy/paste) in Remote Desktop (RDP) session

This settings need to be changed in Local Group Policy Editor.

Click Start, type gpedit.msc in the Start Search box, and then press ENTER

Change:

• Computer Configuration\Administrative Templates\Windows Components\Remote Desktop Services\Remote Desktop Session Host\Device and Resource Redirection\Do not allow clipboard redirection

to Enabled

• User Configuration\Administrative Templates\Windows Components\Remote Desktop Services\Remote Desktop Session Host\Device and Resource Redirection\Do not allow clipboard redirection 

to Enabled

Restart server

https://technet.microsoft.com/en-us/library/ee791794%28v=ws.10%29.aspx

https://technet.microsoft.com/en-us/library/cc731745(v=ws.11).aspx